Electric-brush holder



E. BUE'ROSSE.

ELECTRIC BRUSH HOLDER.

APPUCATION fiLED Nov. 8, 1920.

1,370,277 Patend Mar. 1,1921.

I N VEN TOR'.'

MMM

ATTORNEYS.

UNITED STATES PATENT OFFICE.` t

ERNEST BUEBOSSE, `F MILWAUKEE, WISCONSIN, ASSIGNOR 0F ONE-THIRD TOGEORGE BUEROSSE AND ONE-THIRD T0 GEORGE J'. BUEROSSE, BOTH 0E MIL-WAUKEE, WISCONSIN.

' Speceation of Letters Patent.

ELECTRIC-BRUSH HOLDER.

Patented Mar. 1, 1921.

Application led November 8, 1920. Serial No. 422,495.

specification, reference being had to the accompanying drawing, forminga part thereof.

This invention relates to brush holders for various types of electricgenerators and motors.

Its main objects are to automatically effect and maintain uniform andtrue contact between the working faces of brushes and the commutators orcollector rings; to prevent the brushes from shifting sidewise and tomaintain them in proper'position relative to the commutators orcollector rings without interfering with their free rocking movementsidewise and maintaining true contact with the commutators or.ycollector rings; to avoid unequal and undue wear of the brushes and ofthe commutators or rings withwhich they engage; and generally to improvethe construction and operation of electric brush holders.

It consists in `the construction, arrangement and combination of partsas hereinafter particularly described and pointed out in the claims.

In the accompanying drawing like characters designate the same' parts inthe several figures.

Figure 1 is a side elevation of a brush holder embodying the inventionin connection with the commutator or rotary contact member of anelectric machine and a brush supporting yoke; Fig. 2 is an enlarged viewpartlyv in side elevation and partly in section of the brush holder, thesection cutting the floating block or head of the holder on the line3-3, F ig. 4; Fig. 3 is a plan viewV of the brush holder with a ortionof the brush supporting yoke; and iig. 4 is a cross section of the brushholder showlng the floating block or head and a brush attachedy theretoin elevation as viewed from the left relative to Figs. 2 and 3.

Referring to Figs. 1 and 3, a desi nates a commutator, collector orrotary e ectric contact member of an electric machine, and b a brushsupporting yoke angularly adjustable coaXially with the commutator andprovided with transverse studs c, preferably adjustable toward and fromthe axis of the commutator.

The brush holder constituting the present lnventlon comprises arelatively stationary block or head 1, Vand a floating brush supportingblock or head 2, preferably made of' electric conducting material suchas copper orbrass.

As shown vin Figs. 2, 3 and 4, the blocks or heads l and 2 are formedwith alined counterbored holes 4, in which the ends of closely coiledparallel helical springs 5 are seated, and are fastened by screws 6,engaging the convolutions 'of the springs adjacent their ends.

The springs form an elastic or resilient connection between the blocksor heads 1 and 2, which permits the floating block 2 to rock or tiltsidewise and to yield lengthwise in a direction approximately radial tothe commutator or rotary contact member a of the electric machine withwhich the brush holder is used. v

A carbon block or brush 8 is fastened to the floating block or head 2 inany suitable manner, for example as shown, by a screw 9, passing througha hole in thebrush and threaded in the block 2.

The block or head 1 is formed or provided with a clamping collar 11, orother suitable means for adjustably mounting it on a yoke stud c.

One of the blocks or heads, preferably the fioating block or head 2, isformed on the inner side facing the block 1, with a longitudinal guidinggroove 13, and a guide rod 14:, loosely engaging at one end with saidgroove, is fastened at the other end to the other block. This guide rod,while it permits the block or head 2 to rock sidewise so as to maintaintrue contact between the brush 8 and the commutator or rotary contactmember a and to move lengthwise in a radial direction relative to thecommutator, prevents its shifting bodily' sidewise and maintains it inproper working position on the commutator. It also serves as a strut toprevent the brush from being shifted out of place toward the block orhead 1 by the rotation of the commutator in the direction indicated bythe arrow on Fig. 1.

The blocks 1 and 2 are preferably connected by a'fiexible electricconductor 16, to carry the current between the brush S and stud cindependently of the springs 5.

The brush supporting stud c is adjusted on the yoke and the brush holderis adj usted on the stud? so that the brush S Will stand radiallyrelative to the commutator or rotary contact member e, as shown in ig.l, in proper position `to engage with its peripheral Working face, andthe springs 5 Will be flexed sul'liciently to maintain a. lightlyyielding contact between the brush and commutator, and prevent sparking.

In the 'operation of the brush holder, the brush adjusts itselicautomatically to maintain uniform and effective electric contactbetiveen the entire areav oi' its Working face and the opposing WorkingJrace of the commutator or rotary electric contact member. The pressureof the outwardly' flexed springs 5 being evenly distributed over theWorking lace or the brush, causes it and the Working]T face of thecommutator or rotary Contact member to Wear evenly, the brush rocking`freely sideivise and yielding radially to compensate or anyirregularities and ccentricity in the Working fare or the commutator orrotary contact member.

rhe blocks or heads l and 2 may be connected by one or more springs 5arranged substantially as shown, to permit the required movements ot'the brush S and to maintain it in proper position relative to thecommutator or rotary contact member e.

Various modifications in the details ot' construction and arrangement ofparts oi the brush holder and in the mounting; ol1 the same, may bemade, Without departure 'lroin the principle and scope of the inventionas defined in the following claims.

I claim:

l. ln an electric brush holder the combination ot a stationary head, atloati brush-supporting head, and num er ot substantially parallelsprings connecting;` the heads with each other.

ln an electric brush holder the combi nation of a relatively stationaryheath a iioating brush-supporting head, and sub stantially parallelhelical springs connecting' the heads with each other.

In an electric brush holder the combination of a relatively stationaryhead, a floatingy brush supporting head, an elastic connection betweenthe heads permitting` a sideivise rocking` movement of the floating headand yielding movement thereof in a radial direction relative to therotary contact member with which the brush engages.

4. In an electric brusn holder the combination of a stationary head.l afloatingr brushvsupporting head, an elastic connection betion the otherend with the other head, which is niiovable thereon tovmvd and from therotary contact member ".vith which the brush engages.

5. ln an ele: ie brush holder the combi nation ci sta E, and floating'heads formed with :dined countcrsunlr holes, a S0 helical spring);seated in said holes.y and screws engaging' the coii'v'olutions ot thesprings adjacent their ends and securing: teem in the heads.

7. ln an electric brush holder the combi a5 nation of? a relativelystationary head pro vided "ith clamping; collar ior aneularlv adjustablemounting' on a brush-supporti, stud. a floating brush-Supporting heathand a. spring' connecting' the heads with each (itllel.

8. ln an electric c nation of stationary ant. floating electriiconductorheads, .iieans 1 s electric brush to the float' spring' and Flexible.electric conduc nections bet-Ween said heads,

5l. In combination vvith a rotary ele L contact member and :ibrush-supportine' parallel 'with and adir ble toward and from the artisof the rotaijv n'ieinbilr. a brush holder comprisingr a relativelystationary head provided 'with a clamping collar fior anrularlyadjustable n'iountingij on said stud, 'flea tingr head provided withniea'ns lor las lening' a brush thereto. and, parallel sprintf?tonnectingrl said heat y ith each other.

l0. An electric brush holder compri a relativelyT stationary headAlloatinghri supportine` head havin e' lone-itudinal fr i ing 2groove inthe side toward the other head` parallel springs fastened at the ends toair-l connecting said heads. and a strut an (ruido rod fastened at. oneend to the stationarj.' head and engaging at the other end with the`groove in the Heating: head.

.ln ivitness whereof l hereto ailix my sienature.

d. and.

con- ERNEST BUEROSSE.

